I've got a TC6 that I use for Vintage and sometimes touring (so either 17.5 or 21.5 blinky). If you went to the last IIC you probably passed me - damn near everyone did. I was just wondering if the improvements in the 6.1 make a lot of difference to the driveability of the car. I could see the improved roll control making a difference. Were there other improvements that make it worth updating? Is there a way to make just the anti-roll update?